compressionlisted

# Compression ## Domain Context **What is this skill?** This skill provides expertise in data and context compression: SaaS payload optimization (Zstd, Brotli, Gzip), database storage compression, and AI context window compression (Semantic Summarization, Token Pruning). Use when optimizing API latency, reducing storage costs, or managing long-running agent sessions near context limits. Do NOT use for image/video lossy compression (use product-photo) or file archiving. ## Key Files | File | Purpose | | ---------------------------------------------------- | ---------------------------------------------------------------------------------------- | | `skills/token-efficiency/SKILL.md` | Adjacent authority for prompt and token-budget compression strategy. | | `skills/context-window/SKILL.md` | Adjacent authority for compaction timing and context-budget math. | | `scripts/hooks/pre-compact-hook.py` | Pre-compaction persistence hook that preserves state before context compression. | | `scripts/session/session-ctl.js` | Session-control CLI that exposes wrap, clear, and continue operations around compaction. | | `docs/reference/session-control-wrapper-contract.md` | Canonical session-control contract covering wrap, clear, compact